The classmates,did you see a tree?Not,what you saw is the street both sides or the tree in the park,monotonous,dull and black do not slip away an autumn.Do you see a water?Not,what you saw is the water of the artificial lakes,the 浑 is muddy,the hair is smelly,the visitor washed feet.Did you see bird?Not,that is the cageling,very foolish,will eat.In recent years,along with the progress of the development,society of the economy,the environment of the our country also changes immediately,the great universe is subjected to serious breakage,if we still don't go to move,environmental protection,so at future a certain,our crest will get close to death of move the plant depopulation on-line.Because the our country population character return not enough high,lack understanding to the ecosystem system and do not understand natural regulation,in recent years,our country of the natural environment and the ecosystem balance have already encounter to the serious breakage.For example in order to keep warm,cook a meal,build a house a great deal of breakage forest,then result in the soil erosion,course of river silt up ……
The problem add:A little bit simple,early two levels